In this paper, a new surfactant–polymer enhanced oil recovery (EOR) system is investigated for the feasibility of injection in Dagang. The newSP ﬂooding system has been designed and developed for Dagang oilﬁeld with Dagang petroleum sulfonate (SLPS) as the primary ingredient. The dynamic behavior of the system and the interactions of the system components have been investigated through various methods, including dissipative particle dynamics (DPD) molecular modeling technology and dynamic interfacial-tension analysis. The results have shown a signiﬁcant synergistic effect between sulfonate and nonionic surfactant. The interfacial tension (IFT) and its time to reach equilibrium could be dramatically decreased, suggesting a fast diffusion–adsorption characteristic of ionic surfactants as well as the high surface activity of nonionic surfactants. The SP ﬂooding formulation was optimized. A pilot test has been carried out. The ﬁeld trial provides useful information for the further large-scale application of the SP system in Dagang oilﬁeld.
Key words: Surfactant-polymer ﬂooding, sulfonate, interfacial tension, dynamic behavior, pilot ﬁeld trial.
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